I didn’t offer it as a relevant to subsets. I offered it as relevant to the art of demonstration. You should read more carefully.
By the way, we studied Euclidean geometry every year from about third grade all the way through to the end of high school. And I did pay attention to my math lessons. My math grades, along with my chemistry grades, won me a scholarship to a major research university.
The fact that explicitly excludes appeal to creationist assumptions, as explained in detail in articles on the website.